TC 120
682.98767.00 • 10/04/2018
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Chapter 4: Identifying Controls and
Features
4-1 Identifying Mechanical Controls and Features
To Process Probe
A type K ungrounded thermocouple (Eurotherm P116 controller) or a 1000Ω RTD (M2C
controller) with a stainless steel probe is downstream from the heater to sense process
temperature.
Safety Thermostat
The safety thermostat mounted on the side of the heater tank protects against thermal
runaway. The thermostat guards against the unlikely event of “runaway” heating. If
overheating occurs, the safety thermostat shuts down heater outputs. The unit continues to
pump water through the system to prevent heater damage. The ACS Group recommends that
you install an audible or visual alarm to the terminals provided. Factory installed alarms are
available; see the electrical schematics in the installation packet for more information.
Pressure Relief Valve
If the combined pressure of the cooling supply water and pump discharge exceeds 150 psig
(1,030 kPa/10.3 bar), the pressure relief valve opens and relieves the pressure. This is a non-
adjustable ASME construction valve with a stainless steel spring.
Route a pipe from the pressure relief valve
to a suitable drain to reduce potential scalding hazard.
The drain line must not have any restrictions or back pressure.
Pumps
Pumps range in power from ¾ hp to 7½ hp (0.56 kW to 5.59 kW) and are equipped
with 3-phase ODP motors and seal flush lines as standard.
The pump is a bronze-fitted straight centrifugal type. It features a split case design to
facilitate replacement of the seal. It has a high output capacity with excellent
discharge pressure helping it facilitate turbulence to maximize heat transfer, and is
well suited for the conditions under which it was designed to operate.